7. Crosby, Stills, Nash and Young, 'CSNY 1974'

This sprawling account of CSNY's 1974 tour caught America's only true supergroup at a blazing, prolific high, showing off mostly new material and songs from the members' recent solo albums. That high was also perilously literal. You can hear the bravado and rivalry, generously laced with drugging, in David Crosby's reach for the high notes in "Almost Cut My Hair." The result, across this multi-disc recreation of a typical, marathon night that summer, is a magic made on the edge of chaos, in still-dazzling vocal harmonies and lead-guitar crescendos.